Answer:
ionic compounds are made from metal and non mental elements
Explanation:
in this case it is know as an ionic compound because it contains a charge. For example, NaCl is simply a compound as it contains no charges (the charges cancel out as Cl is -1 and Na is +1)
but OH- is an ionic compound as it has a charge if -1 (O has a -2 charge and H has a +1 charge, so -2+1=-1 so OH has -1 charge)
I NEED NOW PLEASE HELP How many grams of KF are need in order to produce 2.0 mol CaF?
How many grams of Mg would be needed to react with 6.0 moles HCl?
Answer:
72g
Explanation:
The balanced equation of the reaction between Magnesium (Mg) and hydrochloric acid (HCl):
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
Based on this equation, 1 mole of Mg needs to react with 2 moles of HCl.
Hence, 6 moles of HCl will need to react with 6 × ½ = 3 moles of Mg.
Using the formula; mole = mass/molar mass
Molar mass of Mg = 24g/mol
3 = mass/24
mass = 72g.
Some nuclear waste is stored about 600 meters
below the desert in New Mexico inside caverns dug
out of an ancient bed of rock salt. The land above
the storage site is owned by the federal
government. Why do you think this location was
chosen?
Answer:
This location was chosen because rock salt has qualities that can withstand the negative effects of nuclear waste and prevent it from causing any harm to the biosphere and all life in it.
Explanation
How to properly dispose of radioactive waste has always been a great problem due to its very high potential to negatively affect life in every form. There have been several kinds of research into the best ways to dispose of such waste. In times past, we have seen radioactive waste sealed up in drums and disposed of. These drums are not everlasting and can be subject to accidents, weakened by weather, etc thus creating a radioactive leak.
One of the results of the research was to store such waste away far below the ground where there are deposits of rock salt.
Radioactive waste generates tremendous amounts of heat if buried in ordinary underground sites and can contaminate underground water channels with radioactive poisoning. So if it were to be buried underground, it had to be in a site that is impregnable by water with very high resistance to heat.
It has been discovered that rock salt has very high boiling and melting points which are 1413 degrees Celsius and 807 degrees Celsius respectively. This makes the ancient bed of rock salt a preferred location by the US government for storing nuclear waste.
Cheers
3/7 of a sum is Rs.1800. Find the sum
Answer:
the sum is Rs 4,200
Explanation:
Given that
3 by 7 of the sum is $1,800
We need to find out the sum
So,
Here we assume the sum be x
So the following equation should be made
3 ÷ 7 × x = 1800
3x = 1800 × 7
x = (1800 × 7) ÷ 3
= Rs 4,200
Hence, the sum is Rs 4,200
The same would be considered and relevant
What is the change in energy of a gas at a pressure of 105 kPa, if 245 J of energy is added causing a change in volume from 25.3 L to 38.6 L?
Answer:
-1151.5 J
Explanation:
Given that:
The supplies energy = 245 L
The energy used in the expansion of gas = Pressure ×ΔV (change in volume)
At standard conditions;
Pressure = 105 × 10³ Pa
energy used in the expansion = 105 × 10³ Pa × (38.6 - 25.3)L
= 1396.5 J
Thus, the change in the energy of gas = 245 - 1396.5 J
= -1151.5 J
Hence, we can conclude that the gas has lost its own energy in the process of expansion.
1
Which of the following is a mixture?
A air
B copper
C oxygen
D steam
Answer:
A air
Explanation:
Air is a mixture but not compound. Its constituents can be separated. For example: oxygen, nitrogen etc. by physical process.
WILL DO ANY THING TO GET A HELPWhich type of wind occurs over a small area?
Question 3 options:
polar easterlies
the Coriolis effect
trade winds
sea breezes
Answer: Sea breezes
Explanation: Took the test
What do the particles of water look like at A and B? A. B. C. D.
Answer:
Explanation:
Each particle, or corpuscle, of water is a regular icosahedron (20-sided geometrical solid). This is what water particles look like, according to Plato's description in the Timaeus. In the center is the water-particle Plato describes at 55b, with 6 scalene triangles making up each equilateral face of the icosahedron
A mass of 68.45 g of nickel (II) sulfate hydrate, NiSO4∙ nH2O, loses 28.40 g upon dehydration. What is the hydration number of this compound? (Find n.)
Answer:
n=4
Explanation:
n= (154.75×28.40)÷(68.45×18)
n=3.5
n=4(approximately)
Explain the role of a primary consumer and a secondary consumer in a food web.
Answer:
Explanation:
Secondary consumers are organisms that eat primary consumers for energy. Primary consumers are always herbivores, or organisms that only eat autotrophic plants.
Carnivores only eat other animals, and omnivores eat both plant and animal matter.
how did the idea of triads influence the development of the periodic table , even though more than three elements share similar properties ?
A. It established element families
B. It established element groups numbered 1-18
C. It gave rise to the idea of the law of octave
D. It gave rise to the idea of periodicity
Johann Döbereiner identified triads of chemically related elements in 1829 and demonstrated how the properties of the middle element could be anticipated from the properties of the other two. Examples of such triads are lithium, sodium, and potassium.
How did the idea of triads influence the development of the periodic table?
Johann Dobereiner (1780–1849), a German scientist, organized diverse trios of three elements into triads in 1829.Lithium, sodium, and potassium made up one such trio.Triads were based on both chemical and physical characteristics. All known elements could fit on Mendeleev's periodic table, and it also made precise predictions about the presence and characteristics of yet-to-be-discovered elements. Mendeleev organized the elements in his first periodic table according to their masses and other chemical characteristics.Atoms' fundamental chemical structure was unknown at the time.Mendeleev increased the size of his periodic table to include every element at the time. The law of triads was discovered by German scientist Johann Döbereiner, who wrote: "If the elements with similar chemical properties are grouped in the groups of three, the atomic weight of the middle element will be deemed almost equivalent to the arithmetic mean of the two-terminal element's total." The arithmetic mean of the atomic masses of the first and third elements must be about equal to the atomic mass of the second element in order to form a Dobereiner trio.The atomic mass of nitrogen is equal to the arithmetic mean of the atomic masses of carbon and oxygen in this situation, which is 14.They so make up Dobereiner's trio.To learn more about periodic table refer
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Hey I know this looks easy but
Can somebody plz help tell me where to put the organisms in the correct group (only if u know which ones) thanks :3
WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST :DDD!
Answer:
Benthos: crabs, starfish, lobsters, stingrays,, algae
Plankton: diatom, tubeworms
Nekton: whales, sharks, turtles,
Explanation:
The image shows a diagram of a chloroplast, which captures light energy from thesun. In what type of cell would you expect to find these
organelles?
Answer: a plant cell
Explanation:
BRO THIS IS THE 3RD TIME IVE PUT THIS UP CAN SOMEONE HELP NO LINKS OR TROLLS
Answer:
1) AgNO3 (aq) + KCl (aq) -> AgCl (s) + KNO3 (aq)
Ag+ (aq) + NO3- (aq) + K+ (aq) + Cl- (aq) -> AgCl (s) + K+
(aq) + Cl- (aq)
Ag+ (aq) + Cl- (aq) -> AgCl (s)
2) 2NaCl (aq) + K2CO3 (aq) -> Na2CO3 (aq) + 2KCl (aq)
3) Fe(NO3)3 (aq) + 3NaOH (aq) -> Fe(OH)3 (s) + 3NaNO3
(aq)
Fe³+ (aq) + 3NO3- (aq) + 3Na+ (aq) + 3OH- (aq) ->
Fe(OH)3 (s) + 3Na+ (aq) + 3NO3- (aq)
Fe³+ (aq) + 3OH- (aq) -> Fe(OH)3 (s)
4) BaBr2 (aq) + Na2SO4 (aq) -> BaSO4 (s) + 2NaBr (aq)
Ba²+ (aq) + 2Br- (aq) + 2Na+ (aq) + SO4²- (aq) ->
BaSO4 (s) + 2Na+ (aq) + 2Br- (aq)
Ba²+ (aq) + SO4²- (aq) -> BaSO4 (s)
Explanation:
Sorry, I couldn't make the charges superscript. Don't know how.
On #2, no reaction occurs; everything stays aqueous.
Gary wanted to find out if some food colourings contained a banned food dye.
He put a drop of each food colouring and the banned food dye onto some special paper.
He hung the paper in a beaker of water.
After 10 minutes, the banned food dye and some of the dyes from the food colourings had moved up the paper.
Gary’s results are shown below.
(a) Gary wrote the labels on the paper in pencil. Why should he not write them in ink?
Explanation:
njsnjsjiwnaibainaondodnodn9nsine8ni
How much pressure (in atm) would be found in 5.8 moles of an ideal gas at 358 K and volume of 3.9 L?
Answer:
pressure=force / volume
5.8÷3.9
=1.5 ml
Derive Boyle's law.
i'll mark the brainliest for the answer
Answer:
According to Boyle's Law, an inverse relationship exists between pressure and volume. ... The relationship for Boyle's Law can be expressed as follows: P1V1 = P2V2, where P1 and V1 are the initial pressure and volume values, and P2 and V2 are the values of the pressure and volume of the gas after change.
Hope that helps! :)
-Aphrodite
Explanation:
explain how the alpha particle scattering experiment led to a change in the model of the atom from the plum pudding model?
Answer:
So originally, the plum pudding model by J.J Thomson is electrons (negatively charged) held in place by a proton (positively charged) cloud.
Alpha particles are positively charged made of 2 protons + 2 neutrons.
Rutherford's experiment where they beamed those positively charged alpha particles demonstrated that an atom was not a uniform cloud, instead the alpha particles that were deflected was the positively charged nucleus. The alpha particles would also pass through if it didn't hit the nucleus, or be slightly attracted to the negative charge on the electrons. But the overall idea is that Rutherford's experiment changed what the structure of the atom was by discovering that they have a positively charged nucleus due to the deflection of positively charged alpha particles.
Which gas variable has to do with the amount of collisions of gas particles has?
(I think it’s temperature but I’m not sure)
Pressure
Temperature
Amount
Volume
Where can most stars
be found in the H-R
diagram?
A. Main sequence
B. Supergiants
C. White Dwarfs
D. Red Giants
Answer:
main sequence
Explanation:
The main sequence is a band of stars which includes most of them like our sun
A toy balloon is filled to 135 mL at a temperature of 22.5 °C (295.5 K). What temperature in Kelvin does it need to be heated to expand to 250 mL?
Answer:
T2 = 547.2K
Explanation:
Given:
V1 = 135 ml. V2 = 250 ml
T1 = 295.5K. T2 = ?
Using Charles's law and solving for T2,
V1/T1 = V2/T2
T2 = (V2/V1)T1
= (250 ml/135 ml)(295.5K)
= 547.2K (or 273.2°C)
water, soil, temperature, space
Answer:
wdym??
Explanation:
Answer:
wdym by water, soil, temperature, space?
Which chemical reaction is the fastest?
A. Oven cleaner absorbs cooked grease overnight.
B. Cake rises as it cooks in the oven.
C. Drain cleaner fizzes up as it encounters blockages in a pipe.
D. Milk turns sour.
Answer:
C) drain cleaner fizzes up as it encounters blockages in a pipe
Explanation:
Can you help me? I need help.
Answer:
C, blowing through underground tunnels
Explanation:
All the other ones are accurate.
One very common way spores/seeds are spread is through the wind. MAny plants use this to reproduce.
Spreading seeds by burrs is not as common as the other methods of reproduction, and is never used for spore reproduction found in certain organisms.
Lastly we have organisms eating fruit and spreading the seeds. There are two ways fruited plants reproduce. Either A, they reproduce by lettign their fruit fall to the earth, and when the fruit decomposes, the seeds are realesed intot eh soil. Or B, the fruit is eaten by organisms, and spread into the soil during fecalization. The feces of the organism can even help the seeds of the plants grow.
Hope this helps! ;)
Why is the death of a Star important for our life on Earth?
Explanation:
The reason why stars are so important is that they have helped humans navigate through Earth. When it was dark these stars would light up the sky giving people lightly. In addition, stars are very important because they make life on Earth. ... Earth would just be a rock with ice.
. Water is one of our most important resources. Only about 1% of the Earth's water is for human needs. Name four ways you can help conserve water. This is for science btw...
Answer:please see explanation for answers
Explanation:
Water conservation is an approach geared towards controlling how water is used. Because of the ever growing population, which weighs so much on water available to mankind,Over negligence and abuse of our water resources have been a great point of concern, that is why the need for the knowledge of water conservation is preached.
Now, some of the ways we can conserve water include
1. Putting off taps while lathering the hands with soap
2.use of irrigation system to water crops and plants
3.. while brushing, make sure to turn off the tap or faucet
4. use a shower rather than a bath
how many teaspoons of jelly would be required to use 36 slices of bread?
Answer:
depends on how much jelly u like
PLEASE HELP!!!! What is the molarity of a solution that contains 42.9g of calcium chloride in a 45.0L solution?
can anyone give me just the answers??
Answer:
11. Redox
12. Acid/Base
13. Precipitation
14. Combustion
15. Precipitation
How can the respiratory system become damaged?
Answer:
Botched surgery, inhaling harmful toxins and smoking.
Explanation:
Smoking is a death wish.